---
id: CVE-2026-87995
title: >-
  Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI
  platform
summary: >-
  Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI
  platform. From 0.8.11 until 0.11.1,
  src/lib/components/chat/FileNav/PortPreview.svelte rendered terminal port
  content in an iframe sandbox containing both allow-…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-79
  - CWE-1021
vendor: openwebui
product: open_webui
affected:
  - 'open_webui >= 0.8.11, < 0.11.1'
patched:
  - open_webui 0.11.1
published: '2026-09-09'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:14:57.400'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87995'
references:
  - url: >-
      https://github.com/open-webui/open-webui/commit/54d7a223707f03172efbb9e754db6e69709956d0
    label: security-advisories@github.com
  - url: 'https://github.com/open-webui/open-webui/releases/tag/v0.11.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-jmc6-2wr8-h3wj
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-webui/open-webui/security/advisories/GHSA-jmc6-2wr8-h3wj
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00229
epssPercentile: 0.13998
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-10T17:54:14.915324Z'
ingestedAt: '2026-09-12T17:21:46.532Z'
---

## Overview

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.11 until 0.11.1, src/lib/components/chat/FileNav/PortPreview.svelte rendered terminal port content in an iframe sandbox containing both allow-scripts and allow-same-origin. Because the terminal proxy serves that content from the Open WebUI origin, an authenticated user with access to a shared terminal server could host script on a previewed port and take over a victim's account when the victim opened the preview. This issue is fixed in version 0.11.1.

## Affected

- `open_webui >= 0.8.11, < 0.11.1`

## Remediation

Upgrade past the affected range:

- `open_webui 0.11.1`